It definitely is, internally in these characterization tools. We just don't have that for-loop written out right now. Shopping around on google I'm finding pharosc, which is old and hard to find good source code for, and this article from last year: https://www.researchgate.net/publication/224386987_AutoLibGen_An_open_source_tool_for_standard_cell_library_characterization_at_65nm_technology Honestly, writing a characterization tool does sound like a fun endeavor. Could be something I explore during my PhD.